class Solution:
    def longestPalindrome(self, s: str) -> str:
        pass



if __name__ == '__main__':
    print(Solution().longestPalindrome("babad"))
    # print(Solution().longestPalindrome("cbbd"))
    # print(Solution().longestPalindrome("ac"))
    # print(Solution().longestPalindrome("bb"))
    # print(Solution().longestPalindrome("ccc"))
    # print(Solution().longestPalindrome("aacabdkacaa"))